.header{position:fixed;top:0;left:0;right:0;background:var(--light-surface);border-bottom:1px solid var(--border-color);z-index:1000}.header-container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg);height:70px;display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;gap:var(--spacing-sm);text-decoration:none}.logo-icon{width:40px;height:40px;background:var(--primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff}.logo-text{font-size:1.25rem;font-weight:700;color:var(--dark-surface)}.nav{display:flex;align-items:center;gap:var(--spacing-xl)}.nav-link{color:var(--text-muted);font-size:.95rem;font-weight:500;text-decoration:none;transition:color 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h3{font-size:1.08rem;margin-bottom:var(--spacing-sm)}.right-card p{color:var(--text-muted);font-size:.92rem;margin:0}.cta-section{padding:var(--spacing-3xl) 0;background:linear-gradient(135deg,var(--dark-bg) 0%,var(--dark-surface) 100%);position:relative;overflow:hidden}.cta-section:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(38,184,184,.1) 0%,transparent 50%);animation:rotateBg 30s linear infinite}@keyframes rotateBg{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.cta-content{text-align:center;color:#fff;position:relative;z-index:1}.cta-content h2{color:#fff;margin-bottom:var(--spacing-md);font-size:2.5rem}.cta-content p{color:var(--text-light);margin-bottom:var(--spacing-xl);font-size:1.15rem}.cta-content .btn{font-size:1.1rem;padding:18px 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.2s;color:var(--text-light)}.session-item:hover{background:#26b8b826}.session-item.active{background:var(--primary);color:#fff}.session-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.session-title{font-size:.85rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.session-date{font-size:.7rem;opacity:.7}.session-delete{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;display:none;transition:color .2s}.session-item:hover .session-delete{display:block}.session-delete:hover{color:#ef4444}.sessions-loading{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--text-muted);font-size:.85rem;padding:var(--spacing-md)}.no-sessions{color:var(--text-muted);font-size:.85rem;text-align:center;padding:var(--spacing-md)}.sidebar-section h4{display:flex;align-items:center;gap:var(--spacing-xs)}.logout-btn{background:#ef44441a;border:1px solid rgba(239,68,68,.3);cursor:pointer;font-size:inherit;font-family:inherit;width:100%;text-align:left;color:#ef4444;border-radius:var(--radius-md);transition:all .2s}.logout-btn:hover{color:#fff!important;background:#ef4444!important;border-color:#ef4444!important}.sidebar-footer{padding-top:var(--spacing-lg);border-top:1px solid rgba(255,255,255,.1);display:flex;flex-direction:column;gap:var(--spacing-sm);margin-top:auto}.sidebar-link{display:flex;align-items:center;gap:var(--spacing-sm);padding:12px 14px;color:var(--text-light);text-decoration:none;border-radius:var(--radius-md);transition:all .2s;font-size:.95rem}.sidebar-link:hover{background:#ffffff1a;color:#fff}.chat-main{flex:1;display:flex;flex-direction:column;background:#fff}.chat-top-header{padding:var(--spacing-md) var(--spacing-xl);border-bottom:1px solid var(--border-color);background:#fff}.chat-header-info{display:flex;align-items:center;gap:var(--spacing-md)}.chat-avatar{width:45px;height:45px;background:var(--primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:22px}.chat-header-info h2{font-size:1.1rem;margin-bottom:2px}.status{display:flex;align-items:center;gap:6px;font-size:.85rem}.status.online{color:var(--accent-green)}.status.offline{color:var(--text-muted)}.status-dot{width:8px;height:8px;border-radius:50%;background:currentColor}.chat-messages-container{flex:1;overflow-y:auto;padding:var(--spacing-xl);background:var(--light-bg)}.chat-messages{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:var(--spacing-lg)}.chat-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:var(--spacing-xl)}.empty-icon{width:80px;height:80px;background:var(--primary);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;font-size:40px;margin-bottom:var(--spacing-lg)}.chat-empty h2{color:var(--dark-surface);margin-bottom:var(--spacing-sm)}.chat-empty p{color:var(--text-muted);margin-bottom:0}.empty-subtitle{margin-bottom:var(--spacing-xl)!important}.example-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md);max-width:600px}.example-card{padding:var(--spacing-md);background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-md);text-align:left;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:var(--spacing-sm);font-size:.9rem;color:var(--text-dark)}.example-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md)}.example-icon{font-size:1.2rem}.typing-indicator{display:flex;gap:var(--spacing-md);align-items:flex-start}.typing-avatar{width:40px;height:40px;background:var(--primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.typing-bubble{background:#fff;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-lg);border-bottom-left-radius:var(--radius-sm);box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:var(--spacing-md)}.typing-dots{display:flex;gap:4px}.typing-dots span{width:8px;height:8px;background:var(--primary);border-radius:50%;animation:typingPulse 1.4s infinite ease-in-out}.typing-dots span:nth-child(1){animation-delay:0s}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}@keyframes typingPulse{0%,80%,to{transform:scale(.8);opacity:.5}40%{transform:scale(1);opacity:1}}.typing-text{color:var(--text-muted);font-size:.9rem}.backend-error{padding:var(--spacing-md) var(--spacing-xl);background:#fee2e2;color:#dc2626;display:flex;align-items:center;gap:var(--spacing-sm);font-size:.9rem}.backend-error code{background:#0000001a;padding:2px 6px;border-radius:4px}.chat-input-area{padding:var(--spacing-lg) var(--spacing-xl);background:#fff;border-top:1px solid var(--border-color)}.input-wrapper{max-width:800px;margin:0 auto;display:flex;gap:var(--spacing-sm);align-items:flex-end}.chat-input{flex:1;padding:14px 18px;border:2px solid var(--border-color);border-radius:var(--radius-lg);font-size:1rem;resize:none;min-height:52px;max-height:150px;transition:border-color .2s}.chat-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #26b8b81a}.chat-input:disabled{background:var(--light-bg)}.send-btn{width:52px;height:52px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-lg);font-size:20px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}.send-btn:hover:not(:disabled){background:var(--primary-dark);transform:scale(1.05)}.send-btn:disabled{background:var(--border-color);cursor:not-allowed}.input-disclaimer{max-width:800px;margin:var(--spacing-sm) auto 0;font-size:.8rem;color:var(--text-muted);text-align:center}.chat-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:var(--spacing-md);margin-top:70px}.chat-loading-spinner{width:50px;height:50px;border:3px solid var(--border-color);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.chat-loading p{color:var(--text-muted)}.upload-promo{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);background:#26b8b814;border:1px dashed var(--primary);border-radius:var(--radius-md);color:var(--primary);font-size:.9rem;margin-bottom:var(--spacing-xl)}.upload-btn{width:52px;height:52px;background:var(--light-bg);color:var(--text-muted);border:2px solid var(--border-color);border-radius:var(--radius-lg);font-size:20px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;flex-shrink:0}.upload-btn:hover:not(:disabled){border-color:var(--primary);color:var(--primary);background:#26b8b80d}.upload-btn:disabled{cursor:not-allowed;opacity:.5}.upload-btn .spinning{animation:spin 1s linear infinite}.file-preview{max-width:800px;margin:0 auto var(--spacing-md);padding:var(--spacing-md);background:#26b8b814;border:1px solid var(--primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:space-between}.file-preview-content{display:flex;align-items:center;gap:var(--spacing-md)}.file-icon{color:var(--primary)}.file-info{display:flex;flex-direction:column}.file-name{font-weight:600;color:var(--text-dark);font-size:.95rem}.file-size{font-size:.8rem;color:var(--text-muted)}.file-remove-btn{width:32px;height:32px;background:none;border:none;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .2s}.file-remove-btn:hover{background:#dc26261a;color:#dc2626}.upload-error{max-width:800px;margin:0 auto var(--spacing-md);padding:var(--spacing-sm) var(--spacing-md);background:#fee2e2;color:#dc2626;border-radius:var(--radius-md);display:flex;align-items:center;gap:var(--spacing-sm);font-size:.85rem}.upload-error button{margin-left:auto;background:none;border:none;color:#dc2626;cursor:pointer;padding:4px}.file-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:4px 10px;background:#26b8b81a;color:var(--primary);border-radius:var(--radius-full);font-size:.8rem;margin-bottom:var(--spacing-sm)}@media(max-width:900px){.chat-sidebar{display:none}.chat-page{margin-top:70px}}@media(max-width:600px){.chat-messages-container,.chat-input-area{padding:var(--spacing-md)}.example-cards{grid-template-columns:1fr}.file-preview{flex-direction:column;align-items:flex-start;gap:var(--spacing-sm)}.file-remove-btn{align-self:flex-end}}.section-header{text-align:center;max-width:700px;margin:0 auto var(--spacing-3xl)}.section-header h2{font-family:var(--font-serif);margin-bottom:var(--spacing-md)}.section-header p{color:var(--text-muted);font-size:1.1rem}.badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:6px 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0;background:#fff;margin-top:-40px;position:relative;z-index:1}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-lg)}.stat-card{text-align:center;padding:var(--spacing-xl);background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);transition:all .3s ease}.stat-card:hover{transform:translateY(-5px);box-shadow:0 15px 35px #0000001a;border-color:transparent}.stat-icon{width:56px;height:56px;margin:0 auto var(--spacing-md);background:#26b8b81a;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--primary)}.stat-value{font-size:2rem;font-weight:700;color:var(--text-dark);margin-bottom:var(--spacing-xs)}.stat-label{color:var(--text-muted);font-size:.9rem}.about-section{padding:var(--spacing-3xl) 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p{color:var(--text-muted);font-size:.9rem;margin:0}.rag-arrow{font-size:2rem;color:var(--primary);font-weight:700}.tech-category{margin-bottom:var(--spacing-3xl)}.tech-category:last-child{margin-bottom:0}.tech-category h3{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg);font-size:1.25rem}.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-lg)}.tech-card{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-lg);background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);transition:all .3s ease}.tech-card:hover{transform:translateY(-5px);box-shadow:0 15px 35px #0000001a;border-color:transparent}.tech-card-icon{width:48px;height:48px;flex-shrink:0;background:#26b8b81a;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--primary)}.tech-card-info h4{margin-bottom:var(--spacing-xs);font-size:1rem}.tech-card-info p{color:var(--text-muted);font-size:.85rem;margin:0}.architecture-visual{max-width:500px;margin:0 auto}.arch-layer{display:flex;justify-content:center;gap:var(--spacing-lg)}.arch-layer-split{justify-content:center;gap:var(--spacing-xl)}.arch-box{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);background:#fff;border-radius:var(--radius-lg);font-weight:600;box-shadow:0 4px 15px #00000014;transition:all .3s ease}.arch-box:hover{transform:scale(1.05)}.arch-box.frontend{background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:#fff}.arch-box.backend{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}.arch-box.database{background:linear-gradient(135deg,#8b5cf6,#6d28d9);color:#fff}.arch-box.llm{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff}.arch-connector{text-align:center;font-size:1.5rem;color:var(--text-muted);padding:var(--spacing-sm) 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p{color:var(--text-muted);font-size:.8rem;margin:0}.sources-list{display:flex;flex-wrap:wrap;gap:var(--spacing-md);justify-content:center;margin-bottom:var(--spacing-xl)}.source-item{display:flex;align-items:center;gap:var(--spacing-xs);padding:10px 20px;background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-full);font-size:.9rem;color:var(--text-dark);transition:all .2s ease}.source-item:hover{border-color:var(--primary);color:var(--primary)}.source-item svg{color:var(--primary)}.sources-note{text-align:center;color:var(--text-muted);font-size:.9rem}.disclaimer-box{display:flex;align-items:flex-start;gap:var(--spacing-lg);padding:var(--spacing-xl);background:#f59e0b14;border:1px solid rgba(245,158,11,.3);border-radius:var(--radius-lg);max-width:800px;margin:0 auto}.disclaimer-box svg{color:var(--accent-orange);flex-shrink:0}.disclaimer-box h3{color:var(--accent-orange);margin-bottom:var(--spacing-sm)}.disclaimer-box p{color:var(--text-dark);margin:0}.about-cta{padding:var(--spacing-3xl) 0;background:linear-gradient(135deg,var(--dark-bg) 0%,var(--dark-surface) 100%)}.about-cta .cta-content{text-align:center;color:#fff}.about-cta h2{color:#fff;margin-bottom:var(--spacing-md);font-size:2rem}.about-cta p{color:var(--text-light);margin-bottom:var(--spacing-xl)}@media(max-width:1024px){.stats-grid,.tech-grid{grid-template-columns:repeat(2,1fr)}.safety-grid{grid-template-columns:repeat(3,1fr)}.rag-arrow{display:none}.rag-flow{flex-direction:column}}@media(max-width:768px){.about-hero-text h1{font-size:2.2rem}.stats-grid{grid-template-columns:1fr 1fr}.tech-grid{grid-template-columns:1fr}.safety-grid{grid-template-columns:1fr 1fr}.arch-layer-split{flex-direction:column;gap:var(--spacing-md);align-items:center}.arch-connector-split{flex-direction:column;gap:0}.disclaimer-box{flex-direction:column;text-align:center;align-items:center}}@media(max-width:480px){.stats-grid,.safety-grid{grid-template-columns:1fr}}*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #26B8B8;--primary-dark: #1fa3a3;--primary-light: #3dd4d4;--dark-bg: #0f1419;--dark-surface: #1a1f2e;--dark-card: #252d3d;--light-bg: #f8f9fa;--light-surface: #ffffff;--light-card: #ffffff;--text-white: #ffffff;--text-light: #b8c1cc;--text-dark: #1a1f2e;--text-muted: #6b7280;--accent-orange: #f59e0b;--accent-green: #10b981;--accent-blue: #3b82f6;--accent-purple: #8b5cf6;--border-color: #e5e7eb;--border-dark: #374151;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 25px rgba(0, 0, 0, .15);--shadow-card: 0 4px 20px rgba(0, 0, 0, .08);--shadow-glow: 0 0 40px rgba(38, 184, 184, .3);--font-sans: 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wiggle{0%,to{transform:rotate(-3deg)}50%{transform:rotate(3deg)}}.animate-fade-in{animation:fadeIn .5s ease-out forwards}.animate-fade-in-up{animation:fadeInUp .6s ease-out forwards}.animate-slide-left{animation:slideInLeft .5s ease-out forwards}.animate-slide-right{animation:slideInRight .5s ease-out forwards}.animate-scale-in{animation:scaleIn .4s ease-out forwards}.animate-float{animation:float 3s ease-in-out infinite}.animate-pulse-glow{animation:pulseGlow 2s ease-in-out infinite}.animate-bounce{animation:bounce 2s ease infinite}.animate-wiggle{animation:wiggle .3s ease-in-out}.stagger-1{animation-delay:.1s;opacity:0}.stagger-2{animation-delay:.2s;opacity:0}.stagger-3{animation-delay:.3s;opacity:0}.stagger-4{animation-delay:.4s;opacity:0}.stagger-5{animation-delay:.5s;opacity:0}.stagger-6{animation-delay:.6s;opacity:0}.hover-lift{transition:transform .3s ease,box-shadow .3s ease}.hover-lift:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}.hover-scale{transition:transform .2s ease}.hover-scale:hover{transform:scale(1.05)}.hover-glow{transition:box-shadow .3s ease}.hover-glow:hover{box-shadow:var(--shadow-glow)}.gradient-text{background:linear-gradient(135deg,var(--primary),var(--primary-light),var(--accent-blue),var(--primary));background-size:300% 300%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradientShift 4s ease infinite}.shimmer{background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:12px 24px;font-family:inherit;font-size:.95rem;font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s ease}.btn:hover:before{left:100%}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 15px #26b8b84d}.btn-primary:hover{background:linear-gradient(135deg,var(--primary-light),var(--primary));transform:translateY(-2px);box-shadow:0 6px 20px #26b8b866}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:transparent;color:var(--text-dark);border:2px solid var(--border-color)}.btn-secondary:hover{background:var(--light-bg);border-color:var(--primary);color:var(--primary)}.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}.btn-outline:hover{background:var(--primary);color:#fff}input,textarea{font-family:inherit;font-size:1rem;padding:12px 16px;border:2px solid var(--border-color);border-radius:var(--radius-md);outline:none;transition:all .3s ease}input:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 4px #26b8b826}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg)}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.text-primary{color:var(--primary)}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--light-bg)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.badge{display:inline-block;padding:6px 14px;font-size:.8rem;font-weight:600;border-radius:var(--radius-full);transition:all .3s ease}.badge-primary{background:#26b8b826;color:var(--primary)}.badge-primary:hover{background:#26b8b840}.page-transition{animation:fadeInUp .5s ease-out}.loading-dots{display:flex;gap:4px}.loading-dots span{width:8px;height:8px;background:var(--primary);border-radius:50%;animation:bounce 1.4s infinite ease-in-out}.loading-dots span:nth-child(1){animation-delay:0s}.loading-dots span:nth-child(2){animation-delay:.16s}.loading-dots span:nth-child(3){animation-delay:.32s}